James roche



J. ROCHE.

DESK LOCK.

(No Model.)

PatentedJuly 23,1895.-

UNITED TATES ATENT Fries.

JAMES ROCHE, OF TERRYVILLE, CONNECTICUT, ASSIGNOR TO THE EAGLE LOCKCOMPANY, OF SAME PLACE.

DESK-LOCK.

SPECIFICATION forming part of Letters Patent No. 543,316, dated July 23,1895. Application filed May 6, 1895. Serial No. 548,277. (lilo model.)

To all uhom it may concern:

Be it known that I, JAMES ROCHE, of Terryville, in the county ofLitchfield and State of Connecticut, have invented a new Improvement inDesk-Locks; and I do hereby declare the following, when taken inconnection with the accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent, in

Figure 1, a view in front elevation of a lock constructed in accordancewith my invention;

Fig. 2, a view thereof with the cap or cover and guard-plate removed;Fig. 3, a view thereof in vertical central section on the line a. b ofFig. 2; Fig. 4, a plan view of the lock; Fig. 5, a view thereof inlongitudinal section on the line 0 d of Fig. and designed withparticular reference to showing the guard-fingers formed integral withthe case-plate; Fig. 6, a detached perspective view of the saidcaseplate; Fig. 7, a detached perspective view of the housing and itsshank; Fig. 8, a detached perspective View showing one pair of lockingbolts; Fig. 9, a similar view showing the other pair of'locking-bolts;Fig. 10, a view showing the two tumblers; Fig. 11, a detached 'plan by asingle-bitted key.

View of the guard-plate; Fig. 12, a view of the key.

My invention relates to an improvement in self-locking cabinet-locks,particularly designed for' desks, and therefore often styled desk-locks,the object being to produce at a low cost for manufacture a simple,compact, and eifective lock, composed of 'few parts, not liable toderangement, guarded against the insertion of a pickingtool, andconstructed with particular reference to being operated With these endsin view my invention consists in a cabinet-lock having certain detailsof construction and combinations of parts, as will be hereinafterdescribed, and pointed out in the claims.

. In carrying out my invention I employ two diagonally arrangedlongitudinallybowed doubly-pointed sliding tumblers A A corresponding toeach other and taking at their respective ends into notches b in thehooked located above the center of the lock with their concaved orcut-away edges facing downward toward the keyhole D, so as to clear thebit of .the single-bitted key E. The bolts B B are pivoted upon a studF, while the bolts C C are pivoted upon a corresponding stud F, the saidstudsbeing riveted in the wide fiat shank or tail G of the housing G,which projects through the face-plate H of the lock and re-v ceives thehooked ends of the bolts.

It will be noticed that the notches b. in the bolts B B are locatedbelow the stud F and that the notches c in the bolts C and C are locatedabove the stud F, so that the tumblers engage with the bolts of one pairbelow the pivotal center thereof and with the bolts of the other pairabove the pivotal center thereof, whereby the tumblers are given adiagonal position in the lock. The inner tumbler of the twotumblers Aand A and the inner bolts of the two pairs of bolts B B and C C restupon the inner face of said tail or shank of the housing. Twocorresponding bowed steel springs I I have their respective ends enteredinto notches b 0, formed in the bolts B B and C C below the pivotalcenters thereof. These springs exert a constant effort to throw thehooked ends of the bolts outward into their locked orprojeotedpositions. A stump J, interposed between the bolts and located centrallyabove the tumblers, passes through the opening 9 in the shank G of thehousing G and secures the shank to the case-plate K of thelock, theinclosure of the mechanism of the lock being completed by a cap or coverD, corresponding in size to the case-plate K, and constructed with akeyhole D, before mentioned, and with two perforations d (1, receivingthe outer ends of the studs F and F, which have the additional functionof securing the cover to the case-plate. I

The shank G of the housing is constructed with a centrally-arrangedsector-shaped keyopening G which receives the outer edge of formed inthe case-plate to receive the end of the shank of the key. It will beobserved by reference to Figs. 8 and 9 that the bolts 0 and C are madelonger than the bolts B and B, the inner edges of their lower ends beingconstructed to form operating-faces c 0 with which the bit of the keyengages, the clearance-opening G being arranged so as to permit the keyto swing toward the lower ends of the bolts 0 and C, but preventing itfrom swinging toward the bolts B and B.

It will be apparent from the foregoing description that when the lowerends of the bolts 0 and C are thrown outward under the action of the keytheir upper ends will be moved inward, whereby the tumblers willbe slidfrom right to left against the lower ends of the bolts B B, which willbe thrown outward, with the effect of retracting their hooked upperends. The parts are constructed so that through the medium of thesliding tumblers the full movement of the bolts 0 O, which are directlyacted upon by the key, will be repeated in the bolts B B, with which thekey does not engage, but which are thus indirectly acted upon thereby.By the employment of the sliding tumblers I am thus enabled to operateboth sets of bolts with a single-bitted key with the same effect thatthey would be operated by a double-bitted key..

Although I have shown two sliding tumblers and two sets of bolts, eachcomposed of a pair of bolts, it is apparent that the number of bolts andtn mblers may be increased or decreased, as desired.

For the purpose of guarding the lock against the insertion ofa'picking-tool into the housing under the hooks of the bolts, Iconstruct the case-plate K with two corresponding parallel outwardlyprojecting fingers K K, which are separated from each other by thebreadth of the housing and constructed in width to fit closely into theends thereof, so as to prevent a picking'tool from being in sertedthereinto, these fingers being formed integral with and turned outwardat a right angle to the flanges K K formed at the upper end of thecase-plate for the purpose of riveting the same to the face-plate II ofthe lock. They project outward through the housing-opening H, formed inthe said faceplate. A guard-plate L, having a key-sweep L andconstructed at its ends with perforations L L may be set over the studsF and F, in which use it will hold the tumblers in place, as well asassist in holding the springs in place.

It is apparent that in carrying out my invention I may make some changesfrom the construction herein described, and I would, therefore, have itunderstood that I do not limit myself to the same, but hold myself atliberty to make such changes as fairly fall within the spirit and scopeof my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a cabinet or desk lock, the combination with two hookedlocking-bolts, of a donbly pointed sliding tumbler interposed betweenthe said bolts, and engaging with them at points on opposite sides oftheir pivots respectively, whereby motion imparted to one bolt will betransmitted to the other, one of the bolts being constructed with anoperating face for engagement by a key, substantially as described.

2. In a cabinet-lock, the combination with two pivotal key-bolts, ahousing receiving the upper ends of the said bolts,a spring applied tothe lower ends of the bolts below their pivotal points, and exerting aconstant effort to throw their hooked ends outward, and a doublypointed, sliding tumbler interposed between the bolts and taking intonotches formed therein at points above and below the studs, on'whichthey are pivoted respectively, one of the bolts being constructed with adepending operating face for engagement by a key, substantially asdescribed.

3. In a cabinet lock, the combination with the face plate thereof, of ahousing projecting through the said plate and open at its ends, hookedlocking bolts having their hooked ends extending into the said housingand projecting from the ends thereof, means for operating the saidbolts, and a case plate secured to the face-plate, and provided with twooutwardly projecting guard fingers extending through the housing-openingin the face-plate and into the open ends of the housing, which theypartially close, and guard against the insertion of picking tools thereinto, substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

' JAMES ROCHE.

Witnesses:

R. J. PLUMB, OTIS B. HOUGH.

